Para hallar los extremos hay que resolver la ecuación
$$\frac{d}{d x} f{\left(x \right)} = 0$$
(la derivada es igual a cero),
y las raíces de esta ecuación serán los extremos de esta función:
$$\frac{d}{d x} f{\left(x \right)} = $$
primera derivada$$\left(- x - 1\right) e^{x} - e^{x} + \sin{\left(x \right)} - \cos{\left(x \right)} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = -2.33333587152815$$
$$x_{2} = -74.6128255227576$$
$$x_{3} = -65.1880475619882$$
$$x_{4} = -46.3384916404494$$
$$x_{5} = -55.7632696012188$$
$$x_{6} = -21.2057504033486$$
$$x_{7} = -90.3207887907066$$
$$x_{8} = -68.329640215578$$
$$x_{9} = -96.6039740978861$$
$$x_{10} = -52.621676947629$$
$$x_{11} = -18.0641579203891$$
$$x_{12} = -40.0553063332699$$
$$x_{13} = -87.1791961371168$$
$$x_{14} = -99.7455667514759$$
$$x_{15} = -36.9137136796801$$
$$x_{16} = -8.63854825510364$$
$$x_{17} = -49.4800842940392$$
$$x_{18} = -33.7721210260902$$
$$x_{19} = -30.6305283725015$$
$$x_{20} = -11.7810253484544$$
$$x_{21} = -77.7544181763474$$
$$x_{22} = -58.9048622548086$$
$$x_{23} = -43.1968989868597$$
$$x_{24} = -5.50784501393405$$
$$x_{25} = -24.3473430657424$$
$$x_{26} = -228.550865548657$$
$$x_{27} = -62.0464549083984$$
$$x_{28} = -84.037603483527$$
$$x_{29} = -71.4712328691678$$
$$x_{30} = -80.8960108299372$$
$$x_{31} = -14.9225620842711$$
$$x_{32} = -27.4889357188899$$
$$x_{33} = -93.4623814442964$$
Signos de extremos en los puntos:
(-2.333335871528149, 1.5431399786455)
(-74.61282552275759, -1.41421356237309)
(-65.18804756198821, 1.41421356237309)
(-46.33849164044945, 1.41421356237309)
(-55.76326960121883, -1.41421356237309)
(-21.20575040334856, 1.41421357484505)
(-90.32078879070656, 1.41421356237309)
(-68.329640215578, -1.41421356237309)
(-96.60397409788614, 1.41421356237309)
(-52.621676947629034, 1.41421356237309)
(-18.06415792038913, -1.41421331863647)
(-40.05530633326986, 1.4142135623731)
(-87.17919613711676, -1.41421356237309)
(-99.74556675147593, -1.41421356237309)
(-36.91371367968007, -1.41421356237309)
(-8.638548255103636, 1.41556619553664)
(-49.480084294039244, -1.41421356237309)
(-33.77212102609023, 1.41421356237317)
(-30.63052837250149, -1.41421356237162)
(-11.781025348454364, -1.41413110372921)
(-77.75441817634739, 1.41421356237309)
(-58.90486225480862, 1.41421356237309)
(-43.19689898685966, -1.41421356237309)
(-5.5078450139340545, -1.39586345887177)
(-24.347343065742393, -1.41421356175033)
(-228.55086554865747, 1.41421356237309)
(-62.04645490839842, -1.41421356237309)
(-84.03760348352696, 1.41421356237309)
(-71.47123286916779, 1.41421356237309)
(-80.89601082993718, -1.41421356237309)
(-14.922562084271144, 1.4142181642202)
(-27.488935718889916, 1.41421356240363)
(-93.46238144429635, -1.4142135623731)
Intervalos de crecimiento y decrecimiento de la función:Hallemos los intervalos donde la función crece y decrece y también los puntos mínimos y máximos de la función, para lo cual miramos cómo se comporta la función en los extremos con desviación mínima del extremo:
Puntos mínimos de la función:
$$x_{1} = -74.6128255227576$$
$$x_{2} = -55.7632696012188$$
$$x_{3} = -68.329640215578$$
$$x_{4} = -18.0641579203891$$
$$x_{5} = -87.1791961371168$$
$$x_{6} = -99.7455667514759$$
$$x_{7} = -36.9137136796801$$
$$x_{8} = -49.4800842940392$$
$$x_{9} = -30.6305283725015$$
$$x_{10} = -11.7810253484544$$
$$x_{11} = -43.1968989868597$$
$$x_{12} = -5.50784501393405$$
$$x_{13} = -24.3473430657424$$
$$x_{14} = -62.0464549083984$$
$$x_{15} = -80.8960108299372$$
$$x_{16} = -93.4623814442964$$
Puntos máximos de la función:
$$x_{16} = -2.33333587152815$$
$$x_{16} = -65.1880475619882$$
$$x_{16} = -46.3384916404494$$
$$x_{16} = -21.2057504033486$$
$$x_{16} = -90.3207887907066$$
$$x_{16} = -96.6039740978861$$
$$x_{16} = -52.621676947629$$
$$x_{16} = -40.0553063332699$$
$$x_{16} = -8.63854825510364$$
$$x_{16} = -33.7721210260902$$
$$x_{16} = -77.7544181763474$$
$$x_{16} = -58.9048622548086$$
$$x_{16} = -228.550865548657$$
$$x_{16} = -84.037603483527$$
$$x_{16} = -71.4712328691678$$
$$x_{16} = -14.9225620842711$$
$$x_{16} = -27.4889357188899$$
Decrece en los intervalos
$$\left[-5.50784501393405, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -99.7455667514759\right]$$